﻿using System;
using System.Web;
using Drill.Integration.Web.Mocks;
using Drill.LocatorPattern;
using NUnit.Framework;

namespace Drill.Integration.Web
{
	[TestFixture]
	public class HttpContextLocatorTests
	{
		[Test]
		public void CanConstructUsingParameterlessConstructor()
		{
			 // Arrange
			// Nothing to arrange.

			// Act
			ILocator<HttpContextBase> locator = new HttpContextLocator();

			// Assert
			Assert.That(locator, Is.Not.Null);
		}

		[Test]
		public void CanConstructUsingConstructorWithHttpContextBaseArgument()
		{
			// Arrange
			HttpContextBase httpContext = new HttpContextMock();

			// Act
			ILocator<HttpContextBase> locator = new HttpContextLocator(httpContext);

			// Assert
			Assert.That(locator, Is.Not.Null);
		}

		[Test]
		public void CanConstructUsingConstructorWithNullHttpContextBaseArgument()
		{
			// Arrange
			HttpContextBase httpContext = null;

			// Act
			// ReSharper disable ExpressionIsAlwaysNull
			ILocator<HttpContextBase> locator = new HttpContextLocator(httpContext);
			// ReSharper restore ExpressionIsAlwaysNull

			// Assert
			Assert.That(locator, Is.Not.Null);
		}

		[Test]
		public void CanLocateInstanceUsingConstructorWithHttpContextBaseArgument()
		{
			// Arrange
			HttpContextBase httpContext = new HttpContextMock();
			ILocator<HttpContextBase> locator = new HttpContextLocator(httpContext);

			// Act
			var itemUnderTest = locator.Locate();

			// Assert
			Assert.That(itemUnderTest, Is.Not.Null);
			Assert.That(itemUnderTest, Is.SameAs(httpContext));
		}

		[Test]
		public void CanLocateNullInstanceUsingParameterlessConstructorAndNotInAspNetWebApp()
		{
			// Arrange
			ILocator<HttpContextBase> locator = new HttpContextLocator();

			// Act
			var itemUnderTest = locator.Locate();

			// Assert
			Assert.That(itemUnderTest, Is.Null);
		}

		[Test]
		public void CanDisposeUsingParameterlessConstructor()
		{
			// Arrange
			ILocator<HttpContextBase> locator = new HttpContextLocator();

			// Act
			locator.Dispose();

			// Assert
			// Nothing to assert. No exceptions should be thrown.
		}

		[Test]
		public void CanDisposeUsingConstructorWithHttpContextBaseArgument()
		{
			// Arrange
			HttpContextBase httpContext = new HttpContextMock();
			ILocator<HttpContextBase> locator = new HttpContextLocator(httpContext);

			// Act
			locator.Dispose();

			// Assert
			// Nothing to assert. No exceptions should be thrown.
		}

		[ExpectedException(typeof(ObjectDisposedException), ExpectedMessage = "instance has been disposed", MatchType = MessageMatch.Contains)]
		[Test]
		public void CannotLocateInstanceAfterDispose()
		{
			// Arrange
			ILocator<HttpContextBase> locator = new HttpContextLocator();

			// Act
			locator.Dispose();
			locator.Locate();

			// Assert
			// Nothing to assert because the test should throw an expected exception (see ExpectedException attribute).
		}
	}
}